Track grinding brick



July 1,9, 1938.

T. LARssoN 2,124,272

TRACK GRINDING BRICK` Filed Jan. 9, 1936 F/ G. 4 if? Summa/x4 Patented July 19, 1938 yUNITED STA-rss PATENT orifice TRACK GRINDING BRICK Thure Larsson, Worcester, Mass., assgnor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application January 9, 1936, Serial No. 58,349

2 Claims. (Cl. 51-204) The invention relates to reciprocating grinders frame member Illa. Secured to the shaft 2U is a and with regard to its more speciiic features to a crank 22 which is connected by a link 23 to a lever track grinding brick therefor. 24 fulcrumed at 25 on a bracket 25a also uprising One object of the invention is to provide a from and attached to the far frame member 10c. simple and inexpensive construction for a track Thebottom of the lever 2li is connected to a link fi grinding brick and holder. Another object of the 25h which is connected to the carriage l l. rIhus invention is to provide a track grinding brick Whenever the motor It is energized the carriage constructionwhich avoids abrasion of the clampil is reciprocated. ing bar. Other objects will be in part obvious or Referring now to all the figures, I provide a l0 in part pointed out hereinafter, plurality of track grinding bricks 25. 'I'he bricks l0 The vinvention accordingly consists in the feamay be made of any suitable abrasive material, tures of construction, combinations of elements, such as aluminum oxide, silicon carbide, quartz arrangements offparts, and in the several steps or garnet bonded with any desired bond, for and relation andorder of each of said'steps to one example vitried or clay bond, sodium silicate or more of the others thereof, all as will be illusbond, rubber, shellac, or artificial resinous bond, 15

tratively described herein, and the scope of the or any Variety 0f Cement.

application oi" which will be indicated in the In shape each brick, as illustrated in FigsnZ A,follovvirig'claims p and 3, is substantially a rectangular parallel- In the accompanying drawing in which is shown f opiped, but the top of the brick is bevelled on each voneof various possible embodiments of the me- Side 0f the Central portion, as Shown in Fig. 3. 20

cnanicalffeatures of this invention, Referring now particularly to Fles. 2 and 3, in Fig. 1 is a, fragmentary view, partly in Side eleany suitable manner I form a rectangular paraln .vatio'n and Apartly in vertical section, or a track lelepipedel deDreSSiOn 2l in each brick and Onthe 4grinderin which bricks accordinglto the invention tOP` thereof AS ShOWrl in Fie 2, this depression may be made for use, 2l -is symmetrically located with respect to the 25 Fig. 2 isa plan view of ,abriek and' holder, the plan of the brick, and in plan view the depression spindle of the holder being shown in cross section, iS e reetlllgle the lOIlgeSt Side O Which is trans- Fig, 3 'is e vertical Sectional View teken 0n the verse to the direction oiV motion lof the brick in the l line 3-3 of Fig. 2, and machine. Fie. 4 is en end view of e brick and homer show- I provide a holder comprising a spindle 29 hav- 30 ing the clamping bar of the grinder in section. ille e head 3U et 011e end, and the reetelllllal Referring first to Fig. 1, I have therein shown DerellelODDeClel Dertien 3l et the Other end hava track grinder of the type 'illustrated and dee ing grooves or flutes 32 in its side walls of greatest scribed in U. S. Letters Patent No. 1,095,994 to length. P01'ti011 3| iS SOmeWhat Smaller in each W. D. Gherky, and for a more complete illustredimension than the depression 2. I secure the 35 non and description of the grinder than will be' rectangular portion el to the brick te by cementfound herein, reference may be had to that pating it intO the depression 21 with a suitable ent. such a track grinder to which the brick of cement 33. For example, I may use sulphur, or a the present invention may be-applied, may comcombination of sulphur with a small amount of prise a frame member Ill which, together with a carbon such as passes under the name of Lavasul. 40 parallel frame member lila and ways, not shown, Assuming 110W that a number of bricks 26 have supportsacarriage Il for reciprocatory movement had spindles 29 secured to them, they may be parallel to the yell l2 te be ground, the frame l0 mounted in the carriage Il in tandem relation, being supported upon the track or rail thereof by there being Shown in Fig. l foul bricks 26 so means of wheels such as the Wheel Ill, and there mOllllted. Referring DOW t0 Fig- 1, I provide e 45 being a handle I5 by means of which the entire Clamping lealr 43 Which may be Constructed as apparatus may be moved along the rail I2. disclosed in the patent to Gherky referred to, and

Thecarriage Il may be reciprocated in the ways which as therein described comprises a pair of referred to by means of an electric motor i6 similar halves each havingfcomplementary semisecured to a bridge l1 and extending upwardly cylindrical channels M, which channels are posi- 50 from the parallel frame members l0 and Illa, tioned to receive the spindles 2S with a loose iit which motor I6 has a gear I8 secured to its armawhen the bricks 26 are arranged in tandem relature shaft driving a somewhat larger gear I9 tion as shown in Fig. 1 and spaced by separator secured to a shaft 20 Which is journaled in a plates 45. The respective halves of the clamping bracket 2l uprising from and attached to the far bar 43 may be locked together by means oi bolts 55 46. Between the halves of the clamping bar 43 is located a head G1 below a reduced portion 48, the head 4l' being on the lower end of a screw 49 operated by a hand wheel 5t the screw threads of which fit in a nut 5| held by a bridge 52 whose sides 53 are connected to and uprise from the sides of vthe carriage ll as more clearly shown in the patent to Gherky referred to. By means of the hand wheel 58 and screw L29, the bar 43 may be raised and lowered, and may be urged downwardly by the pressure of a spring 54, all as more clearly set forth in the aforesaid patent to Gherky.

The front or left-hand end of the carriage l l has an inclined wall Se and the bricks 26 extend between the vertical right-hand or rear wall of the carriage l l and the vertical plate 6l which is spaced from the inclined wall Si] by a wedge 62. By means of a screw 63 extending through a nut @il and a bridge S5 supported by vertical members 6G extending upwardly from the carriage il, the wedge 62 may be forced downwardly, a hand wheel 61 being provided to rotate the screw 63, and this construction, which is also illustrated in the patent to Gherky referred to, constitutes means for holding the bricks in the carriage l l without excessive knocking during grinding, at the same time allowing raising and lowering of the bricks in lthe carriage ll.

The separator plates 45 are U-shaped, as disclosed in the patent to Gherky referred to, and are carried by the carriage, and do not prevent the bricks from being lowered until all of the abrasive substance thereof is used.

t should be understood that the description of a particular type of track grinder is illustrative merely and that the brick and spindle of the invention may be utilized in many different types of machines. A particular feature of the present invention resides in the fact that each brick is directly secured to the clamping bar and in contact with it; nevertheless owing to the bevelled surfaces on the top of each brick which have already been described, there is no tendency to abrade the clamping bar. As shown in Fig. fi, the clamping bar rests against the upper surface of the rectangular portion 3l and does not contact the brick 2S at all. Slight skewing of the bricks in the machine due to the reciprocation does not bring the top surfaces of the bricks against the clamping bar owing to the beveling of these surfaces. 'I'he manner of attachment of the spindle 29 to the brick secures a strong and permanent union. The construction is inexpensive and for a given sized machine a brick of relatively great height can be used, and the major portion of the brick is usable for actual grinding in the machine.

It will thus be seen that there has been provided by this invention an apparatus in Which the various objects hereinabove lset forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

I claim:-

1. A track grinding brick and spindle comprising a block of bonded abrasive material, a spindle, there being a depression in the top of the block, an enlarged portion integral with the spindle located in the depression and having a shoulder flush with the highest part of the top portion of said block, cement securing the enlarged portion to the block, and the top of the block being bevelled away from the spindle.

2. In a machine of the class described, a frame, a carriage mounted to reciprocate in said frame, means to reciprocate said carriage, a plurality of track grinding bricks each comprising a block of bonded abrasive material, a spindle projecting upwardly from said block, the top portion of said block being bevelled away from said spindle, an enlarged end of said spindle embedded in said brick and cemented thereto and having a shoulder ush with the highest part of the top portion of said block, and a clamping bar mounted in said carriage and surrounding the spindles of the several track grinding bricks and resting upon said shoulder, the entire construction eliminating,V

wear of the bar -due to relative motion between the bar and the bricks.

THURE LARSSON. 

